Pieeee alphonse jesson



Modem I 2 Shets--Sheet I.

P. A; JES0N.

. MACHINE FOR STRETGHING RIDES-0R SKINS.

No. 352,024. PatentedNov. 2, 1886.

Witnesses I Inventor I 33 his flii'avn g N. PETERS. imwum nmr. Washington. a. c.

' UNITED STATES.

PATENT ()rFrcE.

PIERRE ALPHONSE JEsson, or PARIS, FRANCE.

MACHINE FOR STRETC HING HI DES OR SKINS.

SPECIFICATION forming part of Letters Patent No. 352,024, dated November 2 1886,

Application filed September 18, 1886. Serial No. 213,881. (No model.) Patented in France March 11, 1884, No. 142,758 in Germany December 9, 1884, No. 33,014, and in England June 15, 1885, No. 7,268.

machinery the tiresome work of stretching the 1 great dimensions.

hides or skins in the manufacture of leather have not yet, so far as I know, succeeded to general satisfaction, as the stretcher must be pressed with great force, and, as the sweepto be made by it on large skins is rather long, the arms supporting the stretcher must have If not, they will deflect. In the machines hitherto employed pliers with long and heavy arms have been applied, the lower supporting the stretcher and the upper a pressing-roller, between which the leather, retained on a table, was dressed, while the plier, moved to and fro in a horizontal direction, was closed by themachine on its way forward and opened on its return. As great power is needed to keep the plier closed, the constituent parts of the mechanism have not proved satisfactory. By the arrangement shown on the accompanying drawings I get better results, as I obtain the closing of the plier, not as heretofore, outwardly of the working-arms and behind their fulcrum, but directly on their free extremity, almost above the point where the skin is worked between the stretcher and the pressing-roller.

Sheet 1 shows a side elevation of the machine, the framepartly broken away to show the operative parts. Sheet 2 is a plan view.

Ais a frame, of cast-iron, carrying the table- B, in which is a large notch or opening, B, for the free passage of the plier. On the front edge of the table arubber bolster, G, is provided, in order to prevent the leather from slidin g, the workman leaning with his body against it to hold it fast during the process of stretching. The plier D, supported by the slide-bars E, is V-shaped, and to it the lever]? imparts a seesaw or reciprocating motion. The latter, having its fulcrum at the point G, gets its mo-' tion by the crank-shaft H and connecting-rod I. The shaft H is set to work, in any ordinary manner, by a pulley and a gear-wheel.

The arrangement mentioned above so far does not differ from those already known, and I will now describe my improvements. The'arms of the plier D bear in front the parts for-workin g the leather. The upper arm, by means of a joint, K, carries the pressingroller L, made of rubber, and the lower arm, by means of joint M, the supporting-bar and the stretcher, of steel, 0. The rods 1? and Q,which can be lengthened and shortened by rightand-left-hand screw-nuts P Q, connect the joints K and M with the mechanism performing the opening and closing of the plier, this mechanism, composed-of two small crankshafts, R and S, being lodged in the body y of the plier, and connected by cog-wheels R S, keyed on the outside ends.

R is a little larger than S, as the joint K has to make more way than joint M, so that the roller L may be lifted far enough from the table when the plier is opened to allow the workman to freely move the skin on the table. The crank-shaft R carries, outside of the body of the plier, (opposite to the wheel 1%,) a short crank-arm, T, the pin of which is lodged in a sliding bush, U, which, during the to-and-fro motion of the plier sliding ,on the parallel rod V, follows the motion of the plier. The parallel rod V, supported by the links V V, gets by the eccentric W and the rod X during the going of the plier a lowered position and during the return a raised position. It results therefrom that during the going the sliding bush Uwill hold the arm T down, and consequently the crank-shafts R S will draw back the joints K M by means of the rods P Q and keep the plier closed, so thatthe leather is stretched out, while during the return of the plier the parallel rod V in'its elevated position raises the arm T by means of the sliding bush U, and consequently the crank-shafts R S turn the joints K M from one another.

I claim- 1. In a machine for stretching hides or skins, the means for opening and closing the plier close to the point of operation, consisting of the joints K and M, the rods P andQ, and the crank-shafts R S, lodged in the body D of the plier, all combined and operated substantially as shown and described.

2. The combination of the arm '1 0f the up 5 per crank-shaft, R,with a parallel bar, V, ap-

plied to the frame by means of a sliding bush, U, substantially as shown and described, for the purpose of keeping the plier closed during the whole way in one direction and open during its return. IO

In testimony whereof I afiix my signature in presence of two witnesses.

PIERRE ALPHONSE JESSON. Witnesses:

GUSTAVE A. DITTMAR. R0131. M. Hoornn. 

